Ok... How about a two story floating building that is round reflecting the space around it and making subtle reference to the round house nearby. tuck it into the round space that is begging for it. Green roof so it blends in and the views are not of a roof. The first story at the path level so the cafe/club/restaurant relates to the walkway and welcomes people in. Lower story the paddle vessel centre and marina facilities like showers bathrooms. Secure boat storage, rentals, shop. Kayak dock with staging area and kayak launches. Room to stage in the water as well. A larger short term docking zone closer to the shore that is parallel. This displays the visiting boats to the public. The mega yacht storage area is at the back (so the impact of staring at the same boat asses every day is minimized).